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https://issues.apache.org/jira/browse/SOLR-7761?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Houston Putman updated SOLR-7761:
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Attachment: SOLR-7761.patch
> Adding functionality to FunctionValues to support filling external
> MutableValues and having multiple ValueFillers.
> ------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-7761
> URL: https://issues.apache.org/jira/browse/SOLR-7761
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.10.4
> Reporter: Houston Putman
> Priority: Minor
> Labels: patch
> Attachments: SOLR-7761.patch
>
>
> This is mostly a Lucene change that affects some Solr code, so I made the
> issue here. If the issue needs to also be made in Lucene, that can be done.
> Overall this adds the functionality to FunctionValues so that they can fill a
> given MutableValue. This allows functions that have an input and output of
> the same type, like IF, to have generic ValueSources without the need for
> individual sources for every type. This change also gives the ability to make
> ValueFillers for given MutableValues. Therefore MutableValues don't need to
> be created for every ValueFiller and can be re-used.
> Originally this change was made in order to increase performance by recycling
> MutbaleValues. So that one could keep track of a MutableValue and fill it
> without ever changing the reference.
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